// es客户端API二次封装
#pragma once
#include <elasticlient/client.h>
#include <cpr/cpr.h>
#include <jsoncpp/json/json.h>
#include <sstream>
#include <memory>
#include <iostream>
#include "logger.hpp"




bool Serialize(const Json::Value &val, std::string &dst)
{
    // 先定义Json::StreamWriter 工厂类 Json::StreamWriterBuilder
    Json::StreamWriterBuilder swb;
    swb.settings_["emitUTF8"] = true;
    std::unique_ptr<Json::StreamWriter> sw(swb.newStreamWriter());
    //通过Json::StreamWriter中的write接口进行序列化
    std::stringstream ss;
    int ret = sw->write(val, &ss);
    if(ret != 0)
    {
        std::cout << "Json序列化失败!\n";
        return false;
    }
    dst = ss.str();
    return true;
}

bool UnSerialize(std::string &src, Json::Value &val)
{
    // 先定义Json::CharReader 工厂类 Json::CharReaderBuilder
    Json::CharReaderBuilder crb;
    crb.settings_["emitUTF8"] = true;
    std::unique_ptr<Json::CharReader> cr(crb.newCharReader());
    //通过Json::CharReaderr中的parse接口进行反序列化
    std::string err;
    bool ret = cr->parse(src.c_str(), src.c_str() + src.size(), &val, &err);
    if(ret == false)
    {
        std::cout << "Json反序列化失败: " << err << std::endl;
        return false;
    }
    return true;
}


class ESIndex {
public:
    ESIndex(std::shared_ptr<elasticlient::Client> &client,
        const std::string &name, 
        const std::string &type = "_doc"):
        _name(name),
        _type(type),
        _client(client)
    {
        Json::Value analysis;
        Json::Value analyzer;
        Json::Value ik;
        Json::Value tokenizer;

        tokenizer["tokenizer"] = "ik_max_word";
        ik["ik"] = tokenizer;
        analyzer["analyzer"] = ik;
        analysis["analysis"] = analyzer;
        _index["settings"] = analysis;
    }

    ESIndex& append(const std::string &key, 
                const std::string &type = "text",
                const std::string &analyzer = "ik_max_word",
                bool enabled = true)
    {
        Json::Value fields;
        fields["type"] = type;
        fields["analyzer"] = analyzer;
        if(enabled == false) fields["enabled"] == enabled;
        _properties[key] = fields;

        return *this;
    }

    bool create(const std::string &index_id = "default_index_id")
    {
        Json::Value mappings;
        mappings["dynamic"] = true;
        mappings["properties"] = _properties;
        _index["mappings"] = mappings;

        std::string body;
        bool ret = Serialize(_index, body);
        if(ret == false)
        {
            LOG_ERROR("索引序列化失败! ");
            return false;
        }

        // 发起索引创建请求
        try
        {
            auto rsp = _client->index(_name, _type, index_id, body);
            if(rsp.status_code < 200 || rsp.status_code >= 300)
            {
                LOG_ERROR("创建ES索引 {} 失败, 响应状态码异常: {} ", _name, rsp.status_code);
                return false;
            }
        }
        catch (std::exception &e)
        {
            LOG_ERROR("创建ES索引 {} 失败: {} ", _name, e.what());
            return false;
        }

        LOG_DEBUG("测试索引创建成功! ");
        return true;
    }

private:
    std::string _name;
    std::string _type;
    Json::Value _properties;
    Json::Value _index;
    std::shared_ptr<elasticlient::Client> _client;
};


// 单条数据新增
class ESInsert {
public:
    ESInsert(std::shared_ptr<elasticlient::Client> &client,
        const std::string &name, 
        const std::string &type = "_doc"):
        _name(name), _type(type), _client(client)
    {}

    ESInsert& append(const std::string &key, const std::string &val) 
    {
        _item[key] = val;
        return *this;
    }

    bool insert(const std::string id = "")
    {
        std::string body;
        bool ret = Serialize(_item, body);
        if(ret == false)
        {
            LOG_ERROR("索引序列化失败! ");
            return false;
        }

        // 发起索引创建请求
        try
        {
            auto rsp = _client->index(_name, _type, id, body);
            if(rsp.status_code < 200 || rsp.status_code >= 300)
            {
                LOG_ERROR("新增数据 {} 失败, 响应状态码异常: {} ", body, rsp.status_code);
                return false;
            }
        }
        catch (std::exception &e)
        {
            LOG_ERROR("新增数据 {} 失败: {} ", body, e.what());
            return false;
        }

        return true;
    }

private:
    std::string _name;
    std::string _type;
    Json::Value _item;
    std::shared_ptr<elasticlient::Client> _client;
};



// 单条数据删除
class ESRemove 
{
public:
    ESRemove(std::shared_ptr<elasticlient::Client> &client,
             const std::string &name,
             const std::string &type = "_doc") : 
             _name(name), _type(type), _client(client)
    {}

    bool remove(const std::string &id)
    {
        try
        {
            auto rsp = _client->remove(_name, _type, id);
            if(rsp.status_code < 200 || rsp.status_code >= 300)
            {
                LOG_ERROR("删除数据 {} 失败, 响应状态码异常: {} ", id, rsp.status_code);
                return false;
            }
        }
        catch (std::exception &e)
        {
            LOG_ERROR("删除数据 {} 失败: {} ", id, e.what());
            return false;
        }
        return true;
    }

private:
    std::string _name;
    std::string _type;
    std::shared_ptr<elasticlient::Client> _client;
};


// 数据的检索
class ESSearch
{
public:
    ESSearch(std::shared_ptr<elasticlient::Client> &client,
             const std::string &name,
             const std::string &type = "_doc") : 
             _name(name), _type(type), _client(client)
    {}

    ESSearch& append_must_not_terms(const std::string &key, const std::vector<std::string> &vals)
    {
        Json::Value fields;
        for(auto &val : vals)
        {
            fields[key].append(val);
        }
        
        Json::Value terms;
        terms["terms"] = fields;
        _must_not.append(terms);
        return *this;
    }

    ESSearch& append_should_math(const std::string &key, const std::string &val)
    {
        Json::Value field;
        field[key] = val;
        
        Json::Value match;
        match["match"] = field;
        _should.append(match);
        return *this;
    }

    Json::Value search()
    {
        Json::Value cond;
        if(_must_not.empty() == false) cond["must_not"] = _must_not;
        if(_should.empty() == false) cond["should"] = _should;
        Json::Value query;
        query["bool"] = cond;

        Json::Value root;
        root["query"] = query;

        std::string body;
        bool ret = Serialize(root, body);
        if(ret == false)
        {
            LOG_ERROR("索引序列化失败! ");
            return Json::Value();
        }

        // 发起索引创建请求
        cpr::Response rsp;
        try
        {
            rsp = _client->search(_name, _type, body);
            if(rsp.status_code < 200 || rsp.status_code >= 300)
            {
                LOG_ERROR("检索数据 {} 失败, 响应状态码异常: {} ", body, rsp.status_code);
                return Json::Value();
            }
        }

        catch (std::exception &e)
        {
            LOG_ERROR("检索数据 {} 失败: {} ", body, e.what());
            return Json::Value();
        }

        // 需要对响应正文进行反序列化
        Json::Value json_res;
        ret = UnSerialize(rsp.text, json_res);
        if(ret == false)
        {
            LOG_ERROR("检索数据 {} 结果反序列化失败", rsp.text);
            return Json::Value();
        }

        return json_res["hits"]["hits"];
    }

private:
    std::string _name;
    std::string _type;
    Json::Value _must_not;
    Json::Value _should;
    std::shared_ptr<elasticlient::Client> _client;
};